Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac917b29080d5643…

MALICIOUS

PDF

73.3 KB Created: 2021-09-18 01:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48fe66f884ae1dbbfa99adef93d1f7ea SHA-1: 9e4e5b072434a7b2a751086ce9b3aa7727fb8195 SHA-256: ac917b29080d5643c941e1cc72c9a9de8f527bf7d77ce3757d61b89417beef3d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on disposable domains. This suggests a link farm designed to distribute further malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://chuaphucluong.com/uploads/image/files/fasepukiz.pdf In PDF document text
    • http://theonejsc.com/userfiles/file/96834376035.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/90340800362.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/37455702724.pdfIn PDF document text
    • https://www.jakketoes.be/ckfinder/userfiles/files/tawagekipolazenuri.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/65253769169.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/tivirefezixazavagejixam.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/52722293431.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/82312588869.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/tuxubepisimiditevipom.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/dozurafunajigefa.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/80964380428.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109032315541587.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/xifozesuzike.pdfIn PDF document text
    • http://fgosvo.ru/files/files/91120561992.pdfIn PDF document text
    • https://laps.pl/userfiles/file/89230100906.pdfIn PDF document text
    • http://gptools.net/userfiles/file/54583165710.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/28545174609.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/94905265051.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/fubowadagolilifavabeni.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/vojopovapebosijufapoze.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c1376e3c6294ae16aa4346f587d52108/lameperexejasazabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=warship+battle+3d+mod+apk+all+ships+unlockedPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC61 15984 bytes
SHA-256: 271fa089a83b400fd94f65dd2c7991771fb0d571819ff41284d9f4331256a464
font_01_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5C 11276 bytes
SHA-256: 04ade6363542835d88418136738f8efe81ee1ad46accb58433f43e79cdfe7c4f

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